本文關(guān)鍵詞：新型電子式過載繼電器設(shè)計(jì)　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 電子式過載繼電器 過載保護(hù) 負(fù)載不平衡 電磁兼容試驗(yàn)

【摘要】：隨著科學(xué)技術(shù)的迅猛發(fā)展以及電器元件在各個(gè)領(lǐng)域應(yīng)用的不斷深入,人們對(duì)在運(yùn)行中電機(jī)的保護(hù)要求在不斷提高,特別是在現(xiàn)代化、自動(dòng)化的行業(yè)中對(duì)電機(jī)的保護(hù)尤為重要,這就要求控制電機(jī)的電器元件具有多種保護(hù)功能,其中起過載保護(hù)的雙金屬片式過載繼電器準(zhǔn)確性差,而電子式過載繼電器控制準(zhǔn)確,為了滿足用戶對(duì)電子式過載繼電器控制準(zhǔn)確性的要求,本文研制了一種控制準(zhǔn)確、靈敏度高的新型電子式過載繼電器。本文研制的新型電子式過載繼電器是一種無需輔助電源的、同時(shí)具有手動(dòng)復(fù)位和自動(dòng)復(fù)位功能的電子式過載繼電器。此繼電器由動(dòng)作機(jī)構(gòu)、輔助觸頭、電流互感器、控制檢測(cè)單元和外殼等部分組成,采用數(shù)字采樣,單片機(jī)控制,具有電源指示、脫扣指示,測(cè)試按鈕,過載保護(hù)、斷相保護(hù)和負(fù)載不平衡保護(hù)等功能。通過對(duì)動(dòng)作機(jī)構(gòu)原理的介紹,本文提出一種利用電磁理論實(shí)現(xiàn)控制回路常開觸點(diǎn)和常閉觸點(diǎn)轉(zhuǎn)換的方法,以及如何運(yùn)用異形扭簧實(shí)現(xiàn)手動(dòng)復(fù)位和自動(dòng)復(fù)位并存的方法;本文闡述了輔助觸頭系統(tǒng)設(shè)計(jì)中重要的兩個(gè)任務(wù),即觸頭壓力計(jì)算和觸頭材料選擇;通過對(duì)控制檢測(cè)單元軟硬件設(shè)計(jì)的闡述,本文介紹了電子式過載繼電器中電源產(chǎn)生、信號(hào)采集、單片機(jī)信號(hào)處理以及如何使控制回路實(shí)現(xiàn)過載保護(hù)、斷相保護(hù)和自動(dòng)復(fù)位等功能。本文闡述了電子式過載繼電器要通過國(guó)家強(qiáng)制性產(chǎn)品認(rèn)證必須進(jìn)行的幾個(gè)重要的型式試驗(yàn),包括輔助觸頭的接通和分?jǐn)嗄芰�、限制短路電流能力試�?yàn)、電磁兼容試驗(yàn)以及動(dòng)作特性試驗(yàn),分析了影響試驗(yàn)結(jié)果的因素以及改進(jìn)的方法。
[Abstract]:With the rapid development of science and technology and the application of electrical components in various fields, the requirements for the protection of the motor in operation are constantly raised, especially in the modernization. The protection of motor is particularly important in the automation industry, which requires that the electrical components controlling the motor have a variety of protection functions, among which the accuracy of the bimetallic overload relay with overload protection is poor. And the electronic overload relay control is accurate, in order to meet the user's requirements for the electronic overload relay control accuracy, this paper developed an accurate control. A new type of electronic overload relay with high sensitivity is developed in this paper. Electronic overload relay with manual reset and automatic reset. The relay is composed of action mechanism, auxiliary contact, current transformer, control detection unit and shell, etc. It adopts digital sampling. Single-chip microcomputer control, with power indication, tripping indication, test button, overload protection, phase break protection and load imbalance protection and other functions. Through the introduction of the principle of the action mechanism. In this paper, a method to realize the conversion between the normal open contact and the constant closed contact in the control loop by using electromagnetic theory, and the method of how to realize manual reset and automatic reset by using the special-shaped torsion spring are presented. This paper describes two important tasks in the design of auxiliary contact system, namely, the calculation of contact pressure and the selection of contact materials. Through the design of the hardware and software of the control and detection unit, this paper introduces the generation of power supply, signal acquisition, signal processing of single-chip microcomputer and how to realize overload protection in the control loop. This paper describes several important type tests for electronic overload relays to pass the national compulsory product certification, including the ability of connecting and breaking auxiliary contacts. The limited short circuit current capacity test, electromagnetic compatibility test and action characteristic test are analyzed. The factors influencing the test results and the improved method are analyzed.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM58

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